气候变化领域集成服务门户(CCPortal): NUTRIENT RESORPTION AND USE EFFICIENCY AT DIFFERENT CANOPY HEIGHTS OF ALPINE TREE SPECIES ABIES GEORGEI VAR. SMITHII (VIGUIE ET GAUSSEN) CHENG, TIBETAN PLATEAU

CCPortal

	NUTRIENT RESORPTION AND USE EFFICIENCY AT DIFFERENT CANOPY HEIGHTS OF ALPINE TREE SPECIES ABIES GEORGEI VAR. SMITHII (VIGUIE ET GAUSSEN) CHENG, TIBETAN PLATEAU
	Li, Mingcai; Liu, Deyi; Kong, Gaoqiang
通讯作者	Li, MC (通讯作者)
发表日期	2009
ISSN	1505-2249
起始页码	63
结束页码	72
卷号	57 期号:1
英文摘要	Nutrients may be mobilized from senescing leaves and transported to other plant tissues, enabling plants to conserve them and reuse. Nitrogen and phosphorus are two dominant nutrients related to photosynthetic capacity and limiting plant growth. In this study, we examined the effect of canopy height on nutrient use by analyzing N and P concentrations of green and senescent leaves collected from different canopy heights of Abies georgei var. smithii (Viguie et Gaussen) Cheng growing at the alpine timberline in Sergyemla Mt.(4 350 m a.s.1), southeastern Tibetan Plateau. The results showed that N and P concentrations per unit needle mass decreased significantly with needle age, but no significant difference was found among upper, middle and lower canopy. However, area-based N and P concentrations increased with the height of canopy. The leaf level nutrient resorption and use efficiency varied in the order: upper canopy> middle canopy >lower canopy for both N and P. The higher nutrient resorption efficiency had significant relationship with leaf level nutrient use efficiency, that is, higher leaf level nutrient use efficiency was partly due to the high resorption from senescent needles. Additionally, the higher nutrient resorption was related to high current nutrient concentration. Vertical variations of leaf level nutrient use efficiency in this study reflected the strategy of alpine trees to respond to imbalance between light availability and soil nutrients.
关键词	NITROGEN-USE EFFICIENCY INTERNAL DIFFUSION CONDUCTANCE PHOTOSYNTHETIC ACCLIMATION LIGHT INTERCEPTION GROWTH IRRADIANCE SENESCING LEAVES LEAF ANATOMY EVERGREEN CARBON GRADIENTS
英文关键词	nitrogen; phosphorous; nutrient use strategy; light availability; alpine trees; Tibetan Plateau
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Ecology
WOS记录号	WOS:000264371100005
来源期刊	POLISH JOURNAL OF ECOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257636
推荐引用方式 GB/T 7714	Li, Mingcai,Liu, Deyi,Kong, Gaoqiang. NUTRIENT RESORPTION AND USE EFFICIENCY AT DIFFERENT CANOPY HEIGHTS OF ALPINE TREE SPECIES ABIES GEORGEI VAR. SMITHII (VIGUIE ET GAUSSEN) CHENG, TIBETAN PLATEAU[J]. 中国科学院青藏高原研究所,2009,57(1).
APA	Li, Mingcai,Liu, Deyi,&Kong, Gaoqiang.(2009).NUTRIENT RESORPTION AND USE EFFICIENCY AT DIFFERENT CANOPY HEIGHTS OF ALPINE TREE SPECIES ABIES GEORGEI VAR. SMITHII (VIGUIE ET GAUSSEN) CHENG, TIBETAN PLATEAU.POLISH JOURNAL OF ECOLOGY,57(1).
MLA	Li, Mingcai,et al."NUTRIENT RESORPTION AND USE EFFICIENCY AT DIFFERENT CANOPY HEIGHTS OF ALPINE TREE SPECIES ABIES GEORGEI VAR. SMITHII (VIGUIE ET GAUSSEN) CHENG, TIBETAN PLATEAU".POLISH JOURNAL OF ECOLOGY 57.1(2009).